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CHIRP at deep water performance

Old 03-04-2012, 11:14 PM
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Default CHIRP at deep water performance

Hello,
I can see so many people repeating and repeating the same information about CHIRP technology. I also saw many shallow waters (less that 200meter, or 600ft) pics around.

What I don't see anywhere is pictures from real users (not the manufacturer demo pics) of CHIRP at deeper waters? Can you please post your CHIRP pics here at these depths? Can you really see fish in these depths?

Can you also post your Combination of sounder and transducer model?
Old 04-10-2014, 06:16 AM
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Bump, id really like to see this too. So far my Furuno FCV-585 + B164 works well out past 800' and a friend uses a 585 +TM260 past 1000'. Wondering how much better the chirp systems show detail at these depths.
Old 04-10-2014, 06:32 AM
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There are some threads on here with screen shots from swordfishing showing targets at between 1000'-2000'. You'll have to search.
Old 04-10-2014, 06:37 AM
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ill check it out. thanks!
Old 04-10-2014, 12:17 PM
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News flash .......what your looking for isn't here cause it doesn't exist. All the black box high dollar chirps have the same problem at depths like that.....the wont work unless it's flat calm..... The theory of it all is great but if you want consistent performance at those depths look at something like a furuno fcv 295 or 1150. This is not my opinion but the opinions of regional reps at boat shows when asked about this point blank.
Old 04-10-2014, 12:23 PM
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Originally Posted by finmanfish View Post
News flash .......what your looking for isn't here cause it doesn't exist. All the black box high dollar chirps have the same problem at depths like that.....the wont work unless it's flat calm..... The theory of it all is great but if you want consistent performance at those depths look at something like a furuno fcv 295 or 1150. This is not my opinion but the opinions of regional reps at boat shows when asked about this point blank.
Interesting statement. Anyone willing to prove finmanfish wrong? If so post the screen shots!
Old 04-10-2014, 04:21 PM
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I will be watching this debate with great interest, as I am sure many others will...
Old 04-10-2014, 06:43 PM
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Here is a baby chirp shot I posted a while ago. 741xs with a B75M
The first part of the screen is traveling at 20kt and once at depth I slowed down and you can see the screen clear up pretty good. Conditions were pretty sloppy (10-15kt wind and a 4 ft swell) I thought it performed well for a 600w unit. Pretty much auto everything on settings.

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Old 04-10-2014, 08:11 PM
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http://www.thehulltruth.com/marine-e...reenshots.html
Old 04-10-2014, 10:48 PM
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Originally Posted by finmanfish View Post
News flash .......what your looking for isn't here cause it doesn't exist. All the black box high dollar chirps have the same problem at depths like that.....the wont work unless it's flat calm..... The theory of it all is great but if you want consistent performance at those depths look at something like a furuno fcv 295 or 1150. This is not my opinion but the opinions of regional reps at boat shows when asked about this point blank.
The theory of CHIRP is clear. It needs a uniform medium (water) to operate properly. Air bubbles under the ducer distort the signal. Fishfinder will have difficulty matching the transmit and receive pulses. Bad weather = more bubbles under the ducer. Strong targets such as bottom will get through, but weaker targets will be filtered out. The rocking of the boat and the resulting loss of directionality of the soundbeam don't help either.
Old 04-11-2014, 04:43 AM
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Those screenshots are pretty impressive.
Old 04-11-2014, 05:32 AM
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Originally Posted by Akgoff4 View Post
Those screenshots are pretty impressive.
There are more on here, just have to search a bit. And I am sure captjeffg has gotten better than this by now. I'd love to fish with him
Old 04-11-2014, 06:21 AM
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This is very interesting. The screen shots look good.
Old 04-11-2014, 06:50 AM
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There is also a big difference in those screenshots being available if the user has the R599 or X265 series. The good shots seem to come consistently from the larger ducers like 599s. I for one had the same questions and issues using my M265LH and BSM-2. Its been a long time (too long) since I have had a chance to try it again. Since my last attempts, I ahve upgrade software a couple of times and I noticed that my in hull mount was low on fluid so for now, I have to remain optimistic that I will see better perfomrance next time out. However, without seeing a lot of good shots at deep water, I am somewhat suspect.
Old 04-11-2014, 08:09 AM
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What we have here is a "Caveat Emptor" moment! I am a pretty pragmatic and cerebral consumer type. I try not to get emotionally caught up purchases of depreciating assets. It makes sense to me when the factory reps tell you unanimously something is not ready for prime time that you should heed the warning. Tone burst systems are straight forward tried and proven systems. Simple in design and consistent in results. Every industry has seen its "digital revolution" where software rules the day and your pocket book....! Then there is the constant update merry go round that always has side effects and requires constant vigilance and retraining............ Really?.?
Old 04-11-2014, 09:09 AM
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Not real deep shots taken off the NC coast ... Garmin 547xs TM 150 installed on my 21' Whaler














Old 04-11-2014, 09:45 AM
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Originally Posted by Typhoon001 View Post
The theory of CHIRP is clear. It needs a uniform medium (water) to operate properly. Air bubbles under the ducer distort the signal. Fishfinder will have difficulty matching the transmit and receive pulses. Bad weather = more bubbles under the ducer. Strong targets such as bottom will get through, but weaker targets will be filtered out. The rocking of the boat and the resulting loss of directionality of the soundbeam don't help either.
Unfortunately that is not limited to CHIRP,...that issue applies equally to all sonar systems.

Aeration in the water is a negative in any sonar system.

That is why a fairing mounted transducer performs better at depth than a flush mounted unit....especially on larger boats 30' and up...there is several inches of boundary layer ( disturbed water) that can possibly inhibit the sonar signal.
The 5" inches of a fairing puts the face of the transducer into cleaner water and thus a greater possibility of performance at depth.

Last edited by semperfifishing; 04-11-2014 at 10:01 AM.
Old 04-11-2014, 11:19 AM
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My buddy just took delivery of a new 34' Regulator, with the B265LH Chirp transducer. Unfortunately it was a bad ducer so they have to replace it at the dealer.

I'm wondering if he should take the opportunity to switch to the wide beam chirp? B275w??
Old 04-11-2014, 12:31 PM
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Originally Posted by John_Madison CT View Post
My buddy just took delivery of a new 34' Regulator, with the B265LH Chirp transducer. Unfortunately it was a bad ducer so they have to replace it at the dealer.

I'm wondering if he should take the opportunity to switch to the wide beam chirp? B275w??
Does your buddy have side or down scan? How deep does he fish? Does he use his sonar for fish or structure?
Old 04-11-2014, 01:54 PM
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Originally Posted by semperfifishing View Post
Aeration in the water is a negative in any sonar system.

That is why a fairing mounted transducer performs better at depth than a flush mounted unit....especially on larger boats 30' and up...there is several inches of boundary layer ( disturbed water) that can possibly inhibit the sonar signal.
The 5" inches of a fairing puts the face of the transducer into cleaner water and thus a greater possibility of performance at depth.
Those screenshots of the CM599 from Captjeffg look pretty impressive. Do you think a fairing mounted R509 would be even better? Or does speed come into play when you talk about the boundary layer? Would they both work the same as slow speeds?

The reason I ask is that I've currently got a glassed-in Simrad Combi C and if I ever decide to replace it (i.e. if I win the lottery), it looks like the CM599 would fit the existing pocket pretty closely.

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